Lecture11: Ventilation And Perfusion Balance Flashcards
Ventilation does?
Adds O2 and removes Co2
What does Perfusion do?
Removes O2 and adds Co2
What drops the V/Q to ZERO?
When the alveoli are perfused but not ventilated
What is a V/Q of ZERO dubbed?
A Shunt
What makes a V/Q reach infinity
Alveoli are ventilated but not perfused
What is a V/Q of infinity dubbed?
Wasted ventilation
What is the V/Q of a normal whole lung?
0.8
What is the V/Q at the lung’s base?
0.6
What is the V/Q at the lung’s apex?
3.3
The lung at the apex is more…than perfused?
Ventilated
The lung at the base is…ventilated than perfused?
Less
What does the obstruction of small bronchioles lead to?
V/Q rapidly shunts (becomes zero)
What do the destruction of walls of ventilated alveoli lead to?
Increased V/Q and thus wasted ventilation
What affects the rate of diffusion through tissues?
Flick’s law of diffusion
What is the diffusion coefficient of O2?
1
